1 Biology 181, Sections 1, 2H, 3, 4H Drs. Richard Hallick and William Grimes Sept. 14, 2005 VERSION ONE 1) The part of an atom that is neutral (no charge) and has a mass number of 1. a) electron b) proton c) ion d) neutron e) molecule 2) In the Periodic table of elements, the atomic number of carbon is a whole number (6), but the atomic mass is a fraction (12.011). Why? a) isotopes of carbon all have 6 protons, but variable number of neutrons b) carbon atoms have variable numbers of protons, but constant numbers of electrons c) the atomic number is a measure of the number of neutrons and is constant; atomic mass measures the number of protons which vary in carbon isotopes d) the number of protons of an atom is constant, but the number of electrons can vary e) the atomic number is a measure of the number of protons and is constant; atomic mass measures the number of electrons which vary in carbon isotopes 3) The force that results when water encounters a non-polar molecule: a) covalent bond b) van der Waals attractions c) ionic attraction d) hydrogen bond e) hydrophobic 4) Which atom pairs with the given electronegativities would form a covalent bond with the LEAST polarity? a) atom A, 3.0; atom B, 3.0 b) atom A, 3.5; atom B 3.0 c) atom A 2.5; atom B 1.5 d) atom A 2.5; atom B 1.0 e) atom A 3.0; atom B 1.0 5) Animals can synthesize fats from carbohydrates, but not the reverse. Plants can store fats in seeds as oils, and during germination convert the fat to carbohydrates because they have: a) ribsomes b) mitochondria c) chloroplasts d) glyoxysomes e) peroxisomes 6) What molecular motors allow movement along microfilaments? a) myosins b) tubulins c) dyneins d) kinesins e) actins 7) A eukaryotic heterotroph: a) lacks mitochondria b) lacks chloroplasts and mitochondria c) has mitochondria but lacks chloroplasts d) has chloroplasts and mitochondria e) has glyoxysomes and mitochondria

This preview
has intentionally blurred sections.
Sign up to view the full version.

2 8) The organelle found in all eukaryotes that is responsible for modifying and distributing proteins that originated in the endoplasmic reticulum and are destined to become a part of cell membranes or secreted: a) Golgi apparatus b) ribosomes c) peroxisome d) mitochondria e) lysosome 9) The cytoskeleton consists of a) cilia, flagella, and microfilaments b) cilia, microtubules, and microfilaments c) microfilaments, intermediate filaments, and microtubules d) internal cell walls e) microtubules and spindle fibers 10) Which of the following statements does not describe features of viruses? a) can include DNA or RNA as genetic information b) may rapidly mutate to different types c) replicate in our blood in the absence of cells d) may infect different species of animals e) represent a serious threat to human health 11) Apoptosis plays an important role in which of the following diseases: a) cancer

This is the end of the preview. Sign up
to
access the rest of the document.